Hi,
I am new on this list, here I'd like to provide some comments on draft1 sch.
A), Audio
1, LM4550BVH pin 42 is AUDIO_AGND, pin 38 is AUDIO_AVDD. But from
datasheet p.14, if you connected like this, means it's for second
source application otherwise they should be left open(NC). Also I
found that pin 45&46 are NC, that means it acts as primary codec
function but you still can use register set to let 4550 to be
secondary codec, see "Multiple Codecs" in page 26. The pin 6 of
BIT_CLK will be act as either output(24.576MHz/2=AC97_CLK) in primary
codec or input(=AC97_CLK) in secondary mode.
B), Ethernet
1, Can add pull high 10k at U2 pin26/27 <LED1&LED0> to 3V3, see p43
of KSZ8001L.
C, DMX512
1, Vs(pin3) of U8 TSOP4838 should be connected to 5V not 3V3, see p2
of TSOP48[2]. Supposed that it's a old version. But please be noticed
that pin1's(IR_RX) voltage. But if use "new TSOP48xx" series, its
operation voltage is 2.7~5.5V. From Vishay official site, should
currently only have this new part.
I am still viewing other pages of sch.
Thanks,
Adam
[1] http://www.vishay.com/docs/82090/tsop48xx.pdf
[2] http://downloads.qi-hardware.com/people/adam/datasheet/ir/TSOP4838.pdf
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